Thread carrier change device



P. TUCHSCHERER THREAD CARRIER CHANGE DEVICE Filed Aug. 28, 1939. 9

} Patented Mar. 11, 1941 PATENT OFFICE THREAD CARRIER CHANGE DEVICE Paul 'luchscherer, Chemnitz, Germany, assignor to Schubert & Salaer Maachinenfabrik Aktiengesellschaft, Chemnitl, Germany Application August 28, 1939, Serial No. 292,351 In Germany September 1,1938

3 Claims.

The present invention relates to a thread carrier change device for flat knitting machines in which the dog shifting the thread carrier bar consists of two parts which automatically and 5 selectively change ,from one thread carrier bar to another one. '1'

A large number of such thread carrier change devices for flat knitting machines are known already. For the purpose of changing the varione thread carrier bars all these devices use a single dog which allows movement of the thread carrier bar by shifting, oscillating or engaging into a recess of the corresponding stop.

Due to the fact, that by the movement of the dog in the moment of contact the thread carrier bar to be changed loses any support at the point of change, the rebounds occurring hereby may have an unfavorable effect upon the thread carrier bar by causing undesired thread layings 29 which strongly jeopardize the further safe op ration of the dog and thereby reduce the capacity of the machine.

These draw-backs have already been removed by a known device in which this has been achieved by the fact that the dog has been made of two portions alternating between the thread carrier bars one of the said portions during adiustrnent of the other remaining unaltered in its position.

30 As the entire dog arrangement including the adjusting device is mounted upon the brake device, the mass to be moved is rather large. The device, moreover, is extremely complicated and expensive as two slides must be used each having 35 four dogs.

According to the present invention the device is simplified by the fact that the two portions each have one dog only and are oscillatably and displaceably and separated irom each other ar- 40 ranged upon one of two shafts of the brake de-' vice, said portions cooperating in such a manner, that always the portion shifting the thread carrier bar to the point of contact together with this thread carrier bar remains unaltered at the point 45 of contact during adjustment of the other portion of the dog to another thread carrier bar and is adjusted directly after the start of movement of the other portion of the dog in opposite direction in such a manner, that the stop of the thread carrier bar to be shifted is positively guided between the two portions of the dog until the next point of contact is reached.

In the accompanying drawing one construction of a thread carrier change device accordin to to the invention is shown by way of example in connection with a straight knitting machine having three thread carrier bars and two dogs arranged in a single change device.

In this drawing:

Fig. l is a side elevation of the thread carrier 5 change device according to the invention,

Fig. 2 is a front elevation of the device shown in Fig. 1,

Fig. 3 is a perspective view of the device illustrated in Fig. 2 showing all the dogs arranged 10 in a single plane and Figs. 4 and 5 show detail views.

Pivotally mounted in bearings i and 2 of the frame of a straight knitting machine are shafts 3 and 4. Fixed upon the shaft 3 and 4 respec- 15 tively is a lever B and 3 respectively which levers are connected by means of draw members I and 8 respectively to a pattern device, for instance pattern discs, pattern chains or the like, not shown in the drawing.

Slideably mounted upon the shafts 3 and l is a change device or change head 3 which is connected by means of a red I. to a well known brake device not shown in the drawing and driven by the slur bar The shafts 3 and 4 are provided with longitudinal grooves II and I2 respectively the length of which corresponds to the greatest thread carrier way occurring in the operation of the machine.

In the change device or head 9 a toothed segment I3 is mounted upon the shaft 3 and a feather key it of said toothed segment l3 engages the groove Ii. Upon the shaft 4 also two dogs I! and il are mounted in the change device or head a. The dog I! loosely pivoted upon the shaft 4 carries a toothed segment H which i kinemgtically connected to the toothed segment l3 mounted upon the shaft 3 as may be seen from Fig. 4. A. feather key It of the dog it engages into the groove I! provided in the shaft 4 as may 40 be seen from Fig. 5. Provided upon the thread carrier bars 19, 23, II are the stops 2!, 23, 24 all of which are substantially of the same width. The space between the two dogs ii and I3 corresponds to the width of one of the stops 2:, 23 and 2 Attached to the thread carrier bars are in a manner known per se the thread carriers one of which only, i. e. the thread carrier 23 of the thread carrier bar 2| is shown in the drawing. To Show the dog t5 the latter has been illustrated in Fig. 1 in its swung out position.

The thread carrier change deviceaccording to v the invention operates as follows:

By means of the rod ill the change device or head 9 is shifted in a manner known per se. If

for instance by the dog l8 acting upon the stop 24 the thread carrier bar I I is moved in the direction of the arrow illustrated in Hg. 3, then on reaching the point of contact the dog I! moving in front of the stop 24 is, by turning the shaft 3 and by the adjustment of the toothed segments l3 and I1 efl'ected thereby, adjusted to another thread carrier bar to be shifted, for instance to the thread carrier bar 2!,without changing the position of the dog It during this time.

The dog I5, whenshiited in the opposite direction, acts upon the stop 23 of the thread carrier bar 20. Shortly after the start of movement a further adjustment of the dog I! is effected by.

turning the shaft 4. The dog Ii hereby is brought in front of the stop 23 of the thread carrier bar 20. The stop 23 thereby is enclosed bearranged in two change devices or heads, Each of the arrangements having one dog only, however, requires less space and by'this separation a hitherto useless space may be employed.

What I claim is:

1. In a thread carrier change device for flat knitting machines, a plurality of thread carrier bars, a stop carried by each of said thread carrier bars, a thread carrier associated with each 01' said thread carrier bars, means for shifting said thread carrier bars, said means consisting of a toothed segment and a ring spaced from said toother segment, a dog provided at said toothed segment ahd a second dog provided at said ring, a shaft rotatably mounted in bearings provided in the machine frame and carrying said toothed member and said ring, a second shaft rotatabiy mounted in said hearings in parallel relation to said first mentioned shaft, 9. toothed wheel shiftably fixed on said second shaft and means for adjusting said dogs from one of said thread carrier bars to another.

2. A device as set forth in claim 1, inwhich said second dog is slidably mounted on said first mentioned shaft fixed against relative rotation, and said first mentioned dog is rotatabiy and longitudinally shiftably arranged on said first mentioned shaft and is movably connected to said second shaft.

3. A device as set forth in claim 1, in which said second dog is slidably mounted on said first mentioned shat-t fixed against reiative rotation, said first mentioned dog is rotatably and longitudinally shiftably arranged on said first mentioned shaft, said first mentioned dog being provided at a toothed segment movably connected to said toothed wheel mounted on said second shaft and connected to the latter by a groove and feather connection.

PAUL TUCHSCHERER. 

